1、I INCH-POUND 1 MIL-C-15726F AMENDMENT 1 8 October 1991 MILITARY SPECIFICATION COPPER-NICKEL ALLOY, SHEET, PLATE, STRIP, BAR, ROD, AND WIRE This amendment forms a part of MIL-C-l5726F, dated 25 October 1988, and is approved for use by all Departments and Agencies of the Department of Defense. PAGE 8
2、4.3, Delete and substitute “4.3 Test Drocedures.“ 4.3.3, Delete and substitute: “4.3.3 Nondestructive tests. Items selected as specified in 4.2.5 shall be inspected by ultrasonic and liquid penetrant inspections as specified herein.“ 4.3.3.1, Delete and substitute: “4.3.3.1 Ultrasonic inmection. Ult
3、rasonic inspection shall be performed in accordance with MIL-STD-271 as modified by the requirements specified herein. Testing shall be done by the longitudinal wave technique as specified herein. Sheet, strip and wire do not require ultrasonic inspection.“ 4.3.3.1.1, Delete and substitute: “4.3.3.1
4、1 Calibration. The longitudinal wave test shall be calibrated on a flat bottomed reference hole of a diameter as specified in table IV. Holes shall be drilled either into the piece to be tested or into a separate defect free specimen of the same size, shape, material and condition. Holes are to be
5、drilled to mid-section in material up to 1-1/2 inches thick and at least 3/4 inch deep, but no greater than mid-section, in material over 1- 1/2 inches thick, and are to be normal to the surface. The ultrasonic test instrument shall be adjusted so that the response from the reference hole shall be n
6、ot less than 25 percent and not more than 100 percent of screen height.“ AMSC N/A FSC 9525 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. 1 of 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-LS72bF (1) 95 99
7、99906 0493bOb b MIL-C-15726F AMENDMENT 1 Table IV - Ultrasonic testina reference hole. Bars and Rods Material thickness, Hole diameter, inches inches Up to and including 6 Over 6 and including 16 118 1/4 I Plate Material thickness, Hole diameter, inches inches Up to and including 4 1/4 Over 4 1/2 4.
8、3.3.1.2 through 4.3.3.1.4: Add new paragraphs as follow: “4.3.3.1.2 Procedure. The following paragraphs describe the requirements for rod, bar and plate. Procedures for inspecting shapes other than those listed below shall be approved. a. Rod and round bar. Rod and round bar shall be tested using th
9、e longitudinal wave technique. The scanning path shall be circumferential or helical with the beam directed along a radius of the rod. b. Multisided bar. Multisided bar shall be tested using the longitudinal wave technique through each pair of parallel sides. c. Plate. Plate shall be inspected using
10、 the longitudinal wave technique using continuous scanning on an 8 inch grid, and one diagonal in each grid. 4.3.3.1.3 AcceDtance criteria. Any material which produces indications equal to or larger than the response from the flat bottomed hole or which produces a complete loss of back reflection sh
11、all be rejected. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-15726F AMENDMENT 1 4.3.3.1.4 Reference notch removal. If flat-bottomed holes are made in the material to be tested, they shall be so located that their subsequent removal will n
12、ot impair the suitability of the material for its intended use.“ 4.3.3.2, Delete and substitute: “4.3.3.2 Liquid Denetrant inspection. Liquid penetrant inspection shall be in accordance with MIL-STD-271.“ 4.3.3.2.1: Add new paragraph: “4.3.3.2.1 AccePtance criteria. All surfaces shall be free of lin
13、ear indications and of linearly disposed rounded indica- tions. Rounded indications are defined as any indications which are circular or elliptical with the long axis less than three times as long as the other axis and with no sharp corners. Linearly disposed rounded indications are defined as four
14、or more rounded indications in a line with each separated from the adjacent indications by less than 1/16 inch. Rounded indications which are not linearly disposed shall be evaluated in accordance with table V. Material exhibiting rounded indications in excess of those permitted by table V shall be
15、rejected. Table V - Allowable non-linear rounded indications. Maximum size inch Cumulative Number per square -inch Up to 1/32, incl. 20 Over 1/32 to 1/16, incl. 10 Over 1/16 O Custod Navy -Y ian : - SH - MR Preparing activity: (Project 9525-0172) Navy - SH Review activities: Army - MI Navy - MC DIA -IS User activity: Army - ME 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
